US3023162A
Expired / Lapsed
US
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Dewatering aqueous suspensions with quaternized dialkylaminoalkyl acrylates or methacrylates
Assignee: Rohm and Haas Co
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Filing: 1958-03-10
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Granted: 1962-02-27
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Expires: 1978-03-10
Abstract
No abstract record available.
Inventors
- 👤 David B Fordyce
- 👤 Frank J Glavis
- 👤 Melamed Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:26
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C22B1/14; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906; Y10S210/907
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
125 words
A PROCESS OF FACILITATING THE DEWATERING OF AN ACID AQUEOUS SUSPENSION OF FINELY DIVIDED INORGANIC MATERIAL HAVING A PH BETWEEN 0 AND 4 AND CONTAINING DISSOLVED THEREIN A SALT OF A METAL TO BE RECOVERED, SAID SUSPENSION BEING THE PRODUCT OF THE ACID-LEACHING OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF AN ORE CONTAINING THE AFORESAID METAL AND THE PRODUCT OF AN ALKALINE FUSION OF SUCH AN ORE, WHICH COMPRISES MIXING INTO SUCH A SUSPENSION FROM 0.001% TO 3% BY WEIGHT, BASED ON THE WEIGHT OF SUSPENDED MATTER, OF A WATER-SOLUBLE LINEAR POLYMER, HAVING A VISCOSITY AVERAGE MOLECULAR WEIGHT OF AT LEAST 300,000, OF DIMETHYLAMINOETHYL METHACRYLATE HAVING AT LEAST 45% OF ITS UNITS QUATERNIZED WITH ETHYLENE OXIDE, AND FILTERING THE AQUEOUS SYSTEM THEREBY OBTAINED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |